Malicious PDF — malware analysis report

Static analysis result for SHA-256 73866d972908c130…

MALICIOUS

PDF

42.6 KB Created: 2020-08-07 23:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d8f7eb14186083efed8d5c4dd0fd306 SHA-1: 57cc8fa595170ea3a9578e9825adbfc0257a11a3 SHA-256: 73866d972908c130780f82f3d9481045eaf7afef888a2e7f139ddfdf9a86ae0e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination. The document body also contains numerous links to external PDFs, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to attract victims. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=fcc+bcc+hcp+crystal+structure+pdf
    • http://files.apexvoterguide.org/uploads/1/3/0/7/130739120/5314331.pdf
    • http://biraxoloj.dieseledge.com/uploads/1/3/1/4/131437919/f11305306a32.pdf
    • http://files.lentigokennels.com/uploads/1/3/1/4/131453354/4019841.pdf
    • http://palowutiw.amandaauerbach.com/uploads/1/3/0/8/130873804/javurapijani.pdf
    • http://sabogoka.southedinburghartsfair.org/uploads/1/3/1/0/131070450/8127363.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/5686/1077/files/boundaries_participant_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2144/2977/files/organizao_do_ambiente_de_trabalho.pdf
    • https://cdn.shopify.com/s/files/1/0431/3579/5354/files/pakugedagakofufig.pdf
    • https://cdn.shopify.com/s/files/1/0432/7889/3214/files/datatoje.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/nixiwofixukuretopavixu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0886/6974/files/getguru_help_center.pdf
    • https://cdn.shopify.com/s/files/1/0428/5336/7975/files/56581435680.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28650507632.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9880/files/luwamo.pdf
    • https://cdn.shopify.com/s/files/1/0436/7797/4678/files/common_app_recommender.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4577/files/kusalokipikar.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6463/files/voresupira.pdf
    • https://cdn.shopify.com/s/files/1/0432/5025/3979/files/73207255259.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2680/files/92955584973.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006684.bin
cfc6fc0369d2ebe26fd5803bfe9a5fbc03b7426eda1c86e76502b0b1a72c540e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6684 5440 bytes
font_01_sfnt_off000078fe.bin
c91a2ac8464cda57740d91a9906fc7da7e4bf9d59d9ffb57192e9c3204f45a1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78FE 11000 bytes

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